Lately it's been cold + actively snowing, so it just hasn't been appealing to go out and ride. Like another commenter mentioned there's also the factor of it getting dark early. So, it's really just been a lack of motivation on my part recently.
I've been trying out different layering to try to get temps in the sweet not too hot/not too cold spot. Still got more work to do, but am getting there. One thing I found has helped was to throw a handlebar bag on in colder temps - makes it easier to stash something if I get warmer than expected or have some additional if it's colder... beats having a backpack that gets my back sweaty.
I like that... Make the best of the nicer days and push there rather than trying to hit some other quota, riding when it's unpleasant, and getting de-motivated.